South China Sea Ruling at 10 Years: Philippines' Win Still Sets Rules Despite China's Rejection

The landmark ruling delivered by the Permanent Court of Arbitration (PCA) in The Hague on July 12, 2016, in favor of the Philippines regarding the South China Sea, continues to shape regional geopolitics a decade later, despite the People's Republic of China's declaration that it is "null and void." The decision unequivocally invalidated China's significant claims in the region, including its "nine-dash line" and artificial island construction, finding them unlawful under international law. China's refusal to acknowledge the ruling and its efforts to increase its military presence in the area raise questions about the enforceability of international law, while the Philippines' strategic "lawfare" and transparency campaigns continue to garner international support.

The arbitration process began with the Philippines filing a case against China under the United Nations Convention on the Law of the Sea (UNCLOS). The tribunal ruled that China's claims of historic rights within its "nine-dash line" had no legal basis under UNCLOS. Furthermore, it found that China had violated the Philippines' sovereign rights in its exclusive economic zone by interfering with fishing and oil exploration activities and by constructing artificial islands. China's rejection of this ruling has led to accusations of selectively applying international law. Recent collisions and harassment incidents between Chinese Coast Guard vessels and Philippine supply ships have escalated tensions in the region. These events, particularly around the Second Thomas Shoal, indicate a more assertive posture by Beijing.

These geopolitical tensions have the potential to create significant impacts on global markets and the regional economy. The South China Sea is a critical artery for global supply chains, transporting a wide range of goods from electronics to crude oil. Persistent ambiguities regarding legal rights of passage in the region could, over time, lead to higher insurance premiums for vessels transiting the area or altered routing decisions by shipping companies. This situation could increase global trade costs, fuel inflationary pressures, and heighten the fragility of supply chains. For investors, legal uncertainty introduces risk premiums into valuations of assets in and around the waterway, including port infrastructure, offshore energy projects, and aquaculture operations.

The broader economic and political context of the regional tension holds immense significance for energy markets and global trade flows. The South China Sea is estimated to hold 11 billion barrels of untapped oil and 190 trillion cubic feet of natural gas reserves. Disputes over these resources could threaten energy supply security and lead to volatility in global energy prices. Moreover, the United States' strengthening of defense agreements with the Philippines and its increased military presence in the region are deepening the strategic rivalry between China and the U.S.. This directly impacts the peace and stability of the Indo-Pacific region, creating uncertainty in the international investment landscape.

Analysts and market expectations suggest that the principle of the rule of law in the South China Sea is becoming increasingly fragile. The lack of enforcement of the ruling and ongoing tensions could continue to negatively affect trade routes, shipping costs, and investor confidence across the Asia-Pacific. Some experts worry that this situation could set a precedent for other maritime disputes, potentially undermining the stability of exclusive economic zones elsewhere. The inability of the Association of Southeast Asian Nations (ASEAN) member states to present a united front on the issue further complicates efforts to uphold the rule of law in the region. Moving forward, the extent to which the international community supports the ruling and how China maintains its position will be crucial for global trade and investment flows. Any escalation in the region could lead to severe shocks across global supply chains and energy markets.